I don't need it to be all that fancy, but I need to design a guest unit for my house and don't really want to draft it by hand or pay for AutoCAD. Cheap would be good too.

user-inactivated:

Sweet Home 3d. http://www.sweethome3d.com/

I've used this program frequently to design living spaces, basement redesigns, tiny houses, and so forth.

Here's a few examples from their website:


posted 3209 days ago